WO2012027087A2 - Compensation de détecteur de contact et de survol - Google Patents

Compensation de détecteur de contact et de survol Download PDF

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Publication number
WO2012027087A2
WO2012027087A2 PCT/US2011/046818 US2011046818W WO2012027087A2 WO 2012027087 A2 WO2012027087 A2 WO 2012027087A2 US 2011046818 W US2011046818 W US 2011046818W WO 2012027087 A2 WO2012027087 A2 WO 2012027087A2
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WO
WIPO (PCT)
Prior art keywords
touch
hover
sensor
sensors
capacitance
Prior art date
Application number
PCT/US2011/046818
Other languages
English (en)
Other versions
WO2012027087A3 (fr
Inventor
Brian Michael King
Omar Leung
Paul G. Puskarich
Jeffrey Traer Bernstein
Andrea Mucignat
Avi E. Cieplinski
Muhammad U. Choudry
Praveen R. Subramani
Marc J. Piche
David T. Amm
Duncan Robert Kerr
Original Assignee
Apple Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Apple Inc. filed Critical Apple Inc.
Publication of WO2012027087A2 publication Critical patent/WO2012027087A2/fr
Publication of WO2012027087A3 publication Critical patent/WO2012027087A3/fr

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G06F3/04166—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving
    • G06F3/041662—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving using alternate mutual and self-capacitive scanning
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G06F3/04166—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
    • G06F2203/04101—2.5D-digitiser, i.e. digitiser detecting the X/Y position of the input means, finger or stylus, also when it does not touch, but is proximate to the digitiser's interaction surface and also measures the distance of the input means within a short range in the Z direction, possibly with a separate measurement setup
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
    • G06F2203/04106—Multi-sensing digitiser, i.e. digitiser using at least two different sensing technologies simultaneously or alternatively, e.g. for detecting pen and finger, for saving power or for improving position detection
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
    • G06F2203/04108—Touchless 2D- digitiser, i.e. digitiser detecting the X/Y position of the input means, finger or stylus, also when it does not touch, but is proximate to the digitiser's interaction surface without distance measurement in the Z direction
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
    • G06F2203/04111—Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate

Definitions

  • This relates generally to touch and hover sensing and more particularly to devices that can perform both touch and hover sensing.
  • a touch sensitive device can include a touch sensor panel, which can be a clear panel with a touch sensitive surface, and a display device such as a liquid crystal display (LCD) that can be positioned partially or fully behind the panel or integrated with the panel so that the touch sensitive surface can cover at least a portion of the viewable area of the display device.
  • the touch sensitive device can allow a user to perform various functions by touching the touch sensor panel using a finger, stylus or other object at a location often dictated by a user interface (UI) being displayed by the display device.
  • UI user interface
  • the touch sensitive device can recognize a touch event and the position of the touch event on the touch sensor panel, and the computing system can then interpret the touch event in accordance with the display appearing at the time of the touch event, and thereafter can perform one or more actions based on the touch event.
  • Some touch sensitive devices can also recognize a hover event, i.e., an object near but not touching the touch sensor panel, and the position of the hover event at the panel.
  • the touch sensitive device can then process the hover event in a manner similar to that for a touch event, where the computing system can interpret the hover event in according with the display appearing at the time of the hover event, and thereafter can perform one or more actions based on the hover event.
  • touch and hover capabilities in a touch sensitive device are desirable, together they can present a challenge to cooperative performance for accurate, reliable detection of touch and hover events.
  • This relates to compensation for sensors in a touch and hover sensing device. Compensation can be for sensor resistance and/or sensor sensitivity variation that can adversely affect touch and hover measurements at the sensors.
  • the device can gang adjacent sensors together so as to reduce the overall resistance of the sensors.
  • the device can drive the sensors with voltages from multiple directions so as to reduce the effects of the sensors' resistance.
  • the device can apply a gain factor to the
  • Sensor compensation can advantageously provide improved touch and hover sensing.
  • FIG. 1 illustrates an exemplary touch and hover sensing device according to various embodiments.
  • FIG. 2 illustrates an exemplary touch and hover sensing device sensing a touch proximate thereto that can be compensated for according to various embodiments.
  • FIG. 3 illustrates an exemplary touch and hover sensing device that can compensate for a touch signal according to various embodiments.
  • FIG. 4 illustrates an exemplary method to compensate for a touch signal in a touch and hover sensing device according to various embodiments.
  • FIG. 5 illustrates another exemplary method to compensate for a touch signal in a touch and hover sensing device according to various embodiments.
  • FIG. 6 illustrates another exemplary touch and hover sensing device that can compensate for a touch signal according to various embodiments.
  • FIG. 7 illustrates another exemplary method to compensate for a touch signal in a touch and hover sensing device according to various embodiments.
  • FIG. 8 illustrates another exemplary method to compensate for a touch signal in a touch and hover sensing device according to various embodiments.
  • FIG. 9 illustrates an exemplary touch and hover sensing device sensing an object proximate thereto that can be shape profiled according to various embodiments.
  • FIG. 10 illustrates an exemplary method to profile an object shape in a touch and hover sensing device according to various embodiments.
  • FIG. 1 1 illustrates another exemplary method to profile an object shape in a touch and hover sensing device according to various embodiments.
  • FIG. 12 illustrates another exemplary method to profile an object shape in a touch and hover sensing device according to various embodiments.
  • FIG. 13 illustrates an exemplary touch and hover sensing device sensing a small close object and a large distant object that can be differentiated from each other according to various embodiments.
  • FIG. 14 illustrates an exemplary touch and hover sensing device that can differentiate between a small close object and a large distant object according to various embodiments.
  • FIG. 15 illustrates another exemplary touch and hover sensing device that can differentiate between a small close object and a large distant object according to various embodiments.
  • FIG. 16 illustrates an exemplary method to differentiate between a small close object and a large distant object in a touch and hover sensing device according to various embodiments.
  • FIG. 17 illustrates an exemplary touch and hover sensing device sensing concurrently touching and hovering objects according to various
  • FIG. 18 illustrates an exemplary touch and hover sensing device that can concurrently sense a touching object and a hovering object according to various embodiments.
  • FIG. 19 illustrates an exemplary method to concurrently sense a touching object and a hovering object in a touch and hover sensing device according to various embodiments.
  • FIG. 20 illustrates another exemplary method to concurrently sense a touching object and a hovering object in a touch and hover sensing device according to various embodiments.
  • FIG. 21 illustrates an exemplary touch and hover sensing device sensing multiple hovering objects according to various embodiments.
  • FIG. 22 illustrates an exemplary graph depicting capacitance measurement versus sensor position in a touch and hover sensing device according to various embodiments.
  • FIG. 23 illustrates an exemplary method to sense multiple hovering objects in a touch and hover sensing device according to various embodiments.
  • FIG. 24 illustrates an exemplary touch and hover sensing device that can compensate for signal drift according to various embodiments.
  • FIG. 25 illustrates another exemplary touch and hover sensing device that can compensate for signal drift according to various embodiments.
  • FIG. 26 illustrates an exemplary touch and hover sensing device compensating for signal shift according to various embodiments.
  • FIG. 27 illustrates an exemplary method to compensate for signal drift in a touch and hover sensing device according to various embodiments.
  • FIG. 28 illustrates an exemplary touch and hover sensing device that can compensate for sensor resistance according to various embodiments.
  • FIG. 29 illustrates another exemplary touch and hover sensing device that can compensate for sensor resistance according to various embodiments
  • FIG. 30 illustrates another exemplary touch and hover sensing device that can compensate for sensor resistance according to various embodiments
  • FIG. 31 illustrates another exemplary touch and hover sensing device that can compensate for sensor resistance according to various embodiments.
  • FIG. 32 illustrates an exemplary graph depicting capacitance variation versus sensor location in a touch and hover sensing device according to various embodiments.
  • FIG. 33 illustrates a graph depicting compensation for capacitance variation versus sensor location in a touch and hover sensing device according to various embodiments.
  • FIG. 34 illustrates an exemplary method to compensate for capacitance variation as a function of location in a touch and hover sensing device according to various embodiments.
  • FIG. 35 illustrates an exemplary touch and hover sensing device that can switch between touch and hover modes according to various embodiments.
  • FIG. 36 illustrates another exemplary touch and hover sensing device that can switch between touch and hover modes according to various embodiments.
  • FIG. 37 illustrates another exemplary touch and hover sensing device that can switch between touch and hover modes according to various embodiments.
  • FIG. 38 illustrates another exemplary touch and hover sensing device that can switch between touch and hover modes according to various embodiments.
  • FIG. 39 illustrates an exemplary method to switch between touch and hover modes according to various embodiments.
  • FIG. 40 illustrates another exemplary method to switch between touch and hover modes according to various embodiments.
  • FIG. 41 illustrates an exemplary touch and hover sensing device having a grounding shield to minimize interference from the device display at the device touch and hover panel according to various embodiments.
  • FIG. 42 illustrates an exemplary touch and hover sensing device that can minimize interference from the device display at the device touch and sensor panel by providing an optimal distance therebetween according to various
  • FIG. 43 illustrates an exemplary computing system that can perform touch and hover sensing according to various embodiments.
  • FIG. 44 illustrates an exemplary mobile telephone that can perform touch and hover sensing according to various embodiments.
  • FIG. 45 illustrates an exemplary digital media player that can perform touch and hover sensing according to various embodiments.
  • FIG. 46 illustrates an exemplary computer that can perform touch and hover sensing according to various embodiments.
  • a touch and hover sensing device can ensure that a desired hover event is not masked by an incidental touch event, e.g., a hand holding the device, by compensating for the touch event in the sensing signal that represents both events.
  • the device can make adjustments to its sensors and/or the sensing signal to ensure that both events are detected.
  • the device can improve the accuracy of its determination of the device user interface location to which a hovering object is pointing by profiling the object shape.
  • the device can differentiate between object distance and area (or size) so as to properly process the corresponding sensing signal and subsequently perform the intended actions. In some embodiments, the device can improve detection of concurrent hover events. In some embodiments, the device can compensate for signal drift in the sensing signal by adjusting the baseline capacitance of the device. In some embodiments, the device can compensate for resistance from the touch and hover sensors by making adjustments to the sensors and/or the voltage patterns driving the device. In some embodiments, the device can compensate the sensing signal for sensitivity variations of the sensors (generally at issue during a hover event), by applying a gain factor as a function of the location of the hover event to the sensing signal.
  • the device can improve sensor switching between a touch mode and a hover mode by compensating for parasitic capacitance introduced by the switching components in the sensing signal. In some embodiments, the device can improve integration of a display with the sensors by reducing interference from the display at the sensors.
  • FIG. 1 illustrates an exemplary touch and hover sensing device according to various embodiments.
  • touch and hover sensing device 100 can include sensor panel 111 having an array of horizontal lines 101 and vertical lines 102 that can cross over each other to form sensors for sensing a touching object and/or a hovering object.
  • the horizontal lines 101 and the vertical lines 102 can be arranged near each other on the same layer without making direct electrical contact to form the sensors. Other non-orthogonal arrangements of the lines 101, 102 can also be employed based on the needs of the device 100.
  • the horizontal lines 101 and the vertical lines 102 can be electrically conductive traces of conductive material, e.g., indium-tin-oxide (ITO).
  • ITO indium-tin-oxide
  • the conductive material can be transparent, semi- transparent, or opaque depending on the needs of the device 100.
  • the touch and sensing device 100 can also include touch and hover control system 107 that can drive the sensor panel 111 with electrical signals, e.g., AC signals, applied to the horizontal lines 101 and/or the vertical lines 102.
  • the AC signals transmitted to the sensor panel 111 can create electric fields extending from the sensor panel, which can be used to sense objects hovering over or touching on the panel.
  • the touch and hover control system 107 can then measure the change in capacitance caused by the hovering or touching objects on the horizontal lines 101 and/or the vertical lines 102 to detect a hover event or a touch event at the sensor panel 11 1.
  • the touch and hover sensing device 100 can operate based on self capacitance and/or mutual capacitance.
  • self capacitance the self capacitance of the sensor panel 111 can be measured relative to some reference, e.g., ground.
  • An object placed in the electric field near the sensor panel 111 can cause a change in the self capacitance of the sensor panel, which can be measured by various techniques.
  • the touch and hover control system 107 can drive each horizontal line 101 and vertical line 102 to create an electric field extending from the sensor panel 111.
  • the touch and hover control system 107 can then measure the self capacitance on each horizontal line 101 and vertical line 102, where the strongest measurements, e.g., the greatest changes in self capacitance, on the horizontal lines and the vertical lines can indicate the (x,y) location of a hover event or a touch event.
  • the mutual capacitance of the sensor panel 111 can be formed between the crossing or proximate horizontal and vertical lines 101, 102.
  • An object placed in the electric field near the sensor panel 111 can cause a change in the mutual capacitance of the sensor panel, which can be measured by various techniques.
  • the touch and hover control system 107 can drive each horizontal line 101 to create an electric field extending from the sensor panel 111.
  • the touch and hover control system 107 can then measure the change in mutual capacitance on the vertical lines 102, where the strongest measurements, e.g., the greatest changes in mutual capacitance, at the crossings or proximate locations of the horizontal and vertical lines can indicate the (x,y) location of a hover event or a touch event.
  • the touch and hover sensing device 100 can use self capacitance to detect a hover event and mutual capacitance to detect a touch event. In other embodiments, the device 100 can use self capacitance to detect all events. In still other embodiments, the device can use mutual capacitance to detect all events. Various capacitance configurations can be used according to the needs of the device.
  • a capacitance measurement can indicate an absolute capacitance and, in some embodiments, a capacitance measurement can indicate a change in capacitance.
  • FIG. 2 illustrates such an example.
  • a user can grasp touch and hover sensing device 200 with left hand 212, where thumb 212-a touches the device sensing area, and at the same time hover over the device with right hand 214, where finger 214-b points to areas on the device's UI display to cause some action.
  • the devices proximate to the thumb can generate a stronger signal, in some cases, a saturated signal.
  • the sensors detecting the finger can generate a weaker signal, in some cases, a much weaker signal.
  • the device 200 can compensate for the effects of the stronger touch signal.
  • FIG. 3 illustrates an exemplary touch and hover sensing device that can compensate for a touch signal according to various embodiments.
  • sensors formed by sensor lines 301, 302 in touch and hover sensing device 300 can be partitioned (symbolically illustrated by broken lines) into quadrants 300-a, 300-b, 300-c, and 300-d such that the sensing signals associated with the sensors in these quadrants can also be partitioned.
  • the quadrants having stronger touch signals can be detected and separated from the quadrants having weaker hover signals, such that the weaker hover signals can be recovered for further processing and the stronger touch signals can be ignored or discarded.
  • the partitioning can be performed in software and/or firmware, where the quadrants can share sensor lines 301, 302.
  • the partitioning can be done in hardware, where each quadrant can have separate sensor lines 301, 302.
  • each partition includes at least one edge of the device for connecting the sensor lines to drive and sense circuitry.
  • FIG. 4 illustrates an exemplary method to compensate for a touch signal in the touch and hover sensing device of FIG. 3.
  • the capacitance in each partition can be measured (410).
  • a determination can be made whether the capacitance measurement exceeds a predetermined threshold (420). If the measurement exceeds the threshold, indicative of a strong or saturated signal, then the capacitance measurement can be ignored as an incidental touch signal, e.g., a thumb holding the device (430). Otherwise, if the measurement does not exceed the threshold, indicative of a weaker signal, then the capacitance measurement can be retained for further processing as a desired hover signal, e.g., a fmger hovering over the device (440).
  • a desired hover signal e.g., a fmger hovering over the device (440).
  • FIG. 5 illustrates another exemplary method to compensate for a touch signal in the touch and hover sensing device of FIG. 3.
  • the device sensor lines can be driven with a specific voltage so as to ensure that a touch saturates the associated sensors formed by the sensor lines (505).
  • the drive voltage to all the partitions can be the same.
  • the drive voltage in partitions in which an incidental touch is more likely to occur can be the specific voltage so as to saturate the sensors in those partitions, whereas the drive voltage in the remaining partitions can be different so as to properly sense a finger hovering over the device.
  • capacitance in each partition can be measured (510). A determination can be made whether the capacitance measurement exceeds a predetermined threshold (520). If so, indicative of a saturated signal, then the capacitance measurement can be ignored as an incidental touch signal (530). If not, then the capacitance measurement can be retained for further processing as a desired hover signal (540).
  • FIG. 6 illustrates another exemplary touch and sensing device that can compensate for a touch signal according to various embodiments.
  • touch and hover sensing device 600 can include grounding shield 610 around the border of the device.
  • the grounding shield 610 around the border can block the thumb or other object from contacting the device sensors formed by sensor lines 601, 602 and a touch signal being generated therefrom.
  • the grounding shield 610 can be any conductive material coupled to ground to shunt any capacitance from the touching object to ground rather than into the device sensors.
  • the drive voltage configuration of the device can be manipulated to compensate for a touch signal, as described in FIG. 7.
  • FIG. 7 illustrates an exemplary method to compensate for a touch signal in a touch and hover sensing device by adjusting the frequency of the drive voltage according to various embodiments.
  • the ability of a drive voltage to travel along a sensor line can be influenced by the drive voltage's frequency, where higher frequencies can be more adversely affected by the sensor lines' resistance than lower frequencies.
  • the sensors at the start of the sensor lines can see stronger drive voltages than sensors at the end of the sensor lines, thereby generating stronger electric fields and subsequent stronger touch and hover signals.
  • the sensors all along the sensor lines can be driven similarly, thereby generating acceptable electric fields and subsequent touch and hover signals everywhere. This effect of sensor resistance on drive voltage frequencies can be used to compensate for a touch signal.
  • the sensor lines can be driven with a higher frequency drive voltage (710).
  • the capacitance at the sensors formed by the sensor lines can be measured (720).
  • the sensor lines can then be driven with a lower frequency drive voltage (730).
  • the capacitance at the sensors can again be measured (740).
  • the higher frequency capacitance measurements and the lower frequency capacitance measurements can be substantially similar.
  • the higher frequency capacitance measurements and the lower frequency capacitance measurements can be substantially different, the lower frequency capacitance measurements being higher. Accordingly, the higher frequency measurements can be subtracted from the lower frequency measurements, thereby substantially eliminating the incidental touch signals and retaining the desired hover signals (750).
  • FIG. 8 illustrates another exemplary method to compensate for a touch signal in a touch and hover sensing device by driving the device sensor lines from multiple directions according to various embodiments.
  • the resistance from the sensor lines' conductive material can interfere with the drive voltages.
  • the device can ensure acceptable sensing signals in aggregate.
  • horizontal sensor lines can alternate being driven from the right and the left (810). For example, the topmost horizontal sensor line can be driven from the left, the next sensor line from the right, and so on.
  • the sensors formed by the left-driven sensor lines can generate stronger signals at the left of the device, whereas the sensors formed by the right-driven sensor lines can generate stronger signals at the right of the device (based on the assumption that the drive voltages are at least somewhat adversely affected by the sensor lines' resistance).
  • the capacitance measurements for the sensors formed by the left-driven sensor lines can indicate the incidental touch signal (820).
  • the capacitance measurements for the sensors formed by the right-driven sensor lines can indicate the desired hover signal (830).
  • capacitance measurements from the left-driven sensors can be ignored or discarded (840).
  • the incidental touch can be more likely to occur at the sensors on the right side and the desired hover at the sensors on the left side.
  • capacitance measurements from the right-driven sensors can be ignored or discarded.
  • FIGs. 2 through 8 describe an incidental touch as more likely occurring at a side of the device, it is to be understood that other locations, e.g., the top and bottom, the center, and the like, are also possible and readily compensated for according to various embodiments.
  • FIG. 9 illustrates such an example.
  • finger 914-b of hand 914 can hover over touch and hover sensing device 900, where the finger is pointing somewhere in area 928 of the device UI display.
  • various methods associated with hand shape profiling can be used.
  • FIG. 10 illustrates an exemplary method to profile an object shape in a touch and hover sensing device according to various embodiments. In the example of FIG.
  • a determination can be made as to the orientation of a hovering object, e.g., a hand, relative to the touch and hover sensing device, such as the object oriented in an upright position toward an upper right or left corner or center of the device, the object oriented in a reversed position toward a lower right or left corner or center of the device, and so on (1010).
  • the determination can be made by either a user inputting the object orientation or a suitable orientation algorithm calculating the orientation based on the hover signal, for example.
  • the centroid of the object can be calculated (1020). To calculate the centroid, the sensor locations that detected the hovering object can be identified for determining the object area. The centroid of the object area and its corresponding sensor location can then be calculated using any suitable centroid detection algorithm.
  • a pointer can be set at the centroid to indicate an initial estimate of where the object is pointing (1030).
  • the pointer location can be shifted from the centroid location to another sensor location of the object area that is more indicative of where the object is pointing and that is according to the orientation of the object (1040). For example, if the object is oriented toward the upper right of the device UI display, the pointer location can be shifted in the upper-right direction from the sensor location corresponding to the centroid of the determined object area to the upper-right sensor location of that area. Similarly, in another example, if the object is oriented toward the top of the device UI display, the pointer location can be shifted upward from the centroid location to an uppermost sensor location of the object area. A trajectory or some other extrapolation can be made from the pointer onto the UI display to estimate the pointed-to area (1050).
  • an accelerometer or a similar detector in the device can be used to determine where to shift the pointer location (1040).
  • the accelerometer can detect the direction of gravity with respect to the device. Assuming that the object pointing to the device is right-side up and not upside down, the pointer location can be shifted from the centroid location to another sensor location in the direction opposite gravity. The shifted pointer can then be used to estimate the pointed-to area on the UI display (1050).
  • FIG. 11 illustrates another exemplary method to profile an object shape in a touch and hover sensing device according to various embodiments. In the example of FIG.
  • a shape of a hovering object can be determined based on the hovering signal (1110).
  • the sensor locations that detected the hovering object can be used by any suitable shape identification algorithm to determine the area and hence the shape of the object.
  • the centroid of the object can be calculated (1120).
  • the centroid of the determined area and its corresponding sensor location can be calculated using any suitable centroid detection algorithm.
  • a pointer can be set at the centroid to indicate an initial estimate of where the object is pointing (1130).
  • the pointer location can be shifted from the centroid location to another sensor location of the object area that is more indicative of where the object is pointing and that is according to the shape of the object area (1140).
  • the pointer location can be shifted from the centroid to a sensor location in the upper right of the object area.
  • a trajectory or some other extrapolation can be made from the shifted pointer onto the UI display to estimate the pointed-to area (1150).
  • the hovering signal in the determined object area can be curve-fitted to determine the signal maximum, indicative of the portion of the object closest to the touch and hover sensing device and correspondingly where the object is pointing. Accordingly, the pointer location can be shifted from the centroid location to the sensor location corresponding to the signal maximum (1140). The shifted pointer can then be used to estimate the pointed-to area on the UI display (1150).
  • FIG. 12 illustrates another exemplary method to profile an object shape in a touch and hover sensing device according to various embodiments.
  • the motion of a hovering object e.g., a hand
  • Capacitance at times t and t+1 can be measured to detect a hovering object at those times (1210).
  • the measurements can be compared to estimate a direction of motion of the hovering object (1220).
  • sensor locations that detected the object can be used to determine the object positions at times t and t+1.
  • the shift in position between times t and t+1 can then be used to determine the object direction of motion according to any suitable motion detection algorithm.
  • the centroid of time t+1 measurement can be calculated (1230).
  • the sensor locations corresponding to the object can be used to determine the object area.
  • the centroid of the object area and its corresponding sensor location can then be calculated using any suitable centroid detection algorithm.
  • a pointer can be set at the centroid to indicate an initial estimate of where the object is pointing (1240).
  • the pointer location can be shifted from the centroid location in the determined direction of motion to another sensor location of the object area that is more indicative of where the object is pointing and that is according to the object's motion (1250). For example, if the object is moving in an upward direction toward the top of the UI display, the pointer location can be shifted in the upward direction from the centroid location to an uppermost sensor location of the object area.
  • a trajectory or some other extrapolation can be made from the shifted pointer onto the device UI display to estimate the pointed-to area (1260).
  • a smaller object close to a sensing device and a larger object farther away from a sensing device can generate similar sensing signals such that it can be difficult to differentiate between them to determine their areas and/or distances from the device, which may adversely affect subsequent device actions based on the signals.
  • FIG. 13 illustrates such an example.
  • smaller object 1314 having area a can be at distance d from touch and hover sensing device 1300
  • larger object 1324 having axeaA can be at distance D from the device, where A > a and D > d.
  • hover signal 1312 for the smaller object 1314 can be substantially the same as hover signal 1322 for the larger object 1324 such that the differences in the respective distances d and D and areas a are A are not discernible.
  • FIG. 14 illustrates an exemplary touch and hover sensing device that can differentiate between a small close object and a large distant object according to various embodiments.
  • visual capture device 1430 can be disposed at a position proximate to the sensor lines of touch and hover sensing device 1400 to capture image(s) and/or video of a hovering object.
  • the captured image(s) and/or video can then be used to determine the distance and area of the object.
  • the distance of the object from the touch and hover sensing device can be determined according to the object and device positions in the captured image(s) and/or video using any suitable image/video object recognition algorithm.
  • the area of the object can be determined according to the size of the object in the captured image(s) and/or video using any suitable image/video object recognition algorithm.
  • Examples of visual capture devices can include a still camera, a video camera, and the like.
  • the capture device 1430 can be integrated with the touch and hover sensing device 1400. In other embodiments, the capture device 1430 can be separate and proximate to the touch and hover sensing device 1400.
  • FIG. 15 illustrates another exemplary touch and hover sensing device that can differentiate between a small close object and a large distant object according to various embodiments.
  • detectors 1530 can be disposed at positions proximate to the sensor lines of touch and hover sensing device 1500 to detect a hovering object. The distance and area of the object can be determined according to various characteristics of the detectors' signal using any suitable signal processing algorithm. Examples of the detectors can include sonar, infrared, optical, radio, and the like.
  • the detectors 1530 can be integrated with the touch and hover sensing device 1500. In other embodiments, the detectors 1530 can be separate and proximate to the touch and hover sensing device 1500.
  • the sensing signals can be used to differentiate between object distances and areas, as described in FIG. 16.
  • FIG. 16 illustrates an exemplary method to differentiate between a small close object and a large distant object using sensing signals in a touch and hover sensing device according to various embodiments.
  • capacitance at times t and t+1 can be measured to detect a hovering object at those times (1610).
  • the measurements can be used to determine an object area (1620).
  • sensor locations that detected the object can be used to determine the object areas at times t and t+1.
  • the areas can be compared to determine the change in area from time t to time t+1 (1630). Based on the change in area, the distance of the object can be estimated (1640).
  • One of the determined object area, e.g., at time t+1, and the estimated distance can be used in subsequent device action, e.g., to select an element on a display user interface.
  • Other methods can be used to determine object area and distance based on object sensing signals according to various embodiments.
  • an object touching a sensing device can generally produce a stronger signal than an object hovering over the device, such that the touch signal can mask or otherwise reduce detectability of the hover signal when they occur at the same time.
  • the touch signal is intentional and desirable along with the hover signal. Therefore, the stronger touch signal masking the weaker hover signal can be problematic.
  • FIG. 17 illustrates such an example.
  • a user can grasp touch and hover sensing device 1700 with left hand 1712, using thumb 1712-a to touch the device sensing area to provide a touch input, and at the same time hover over the device with right hand 1714, using finger 1714-b to point to areas on the device's UI display to provide a hover input, where the touch and hover inputs can work together to cause some action.
  • the thumb 1712-a touches the device 1700
  • the sensors proximate to the thumb can generate a stronger signal, in some cases, a saturated signal.
  • the sensors detecting the finger can generate a weaker signal, in some cases, a much weaker signal.
  • An example application of concurrent touch and hover sensing can include using a thumb touch to select a button that changes to a particular operating mode of the device while using a finger hover to select an action to perform during that operating mode.
  • FIG. 18 illustrates an exemplary touch and hover sensing device to concurrently sense a touching object and a hovering object according to various embodiments.
  • touch and hover sensing device 1800 can be partitioned (symbolically illustrated by broken lines) into quadrants 1800-a, 1800- b, 1800-c, and 1800-d such that the sensing signals associated with the sensors in these quadrants can also be partitioned.
  • the quadrants having stronger touch signals can be detectible and separate from the quadrants having weaker hover signals, such that both the touch signals and the hover signals can be recovered for further processing.
  • One or more of the quadrants where the touch signal is more likely to occur can be designated as a touch quadrant.
  • one or more of the quadrants where the hover signal is more likely to occur can be designated as a hover quadrant.
  • Some quadrants can be also designated dual quadrants where either touch or hover signals are likely to occur.
  • the left-most quadrant is designated as a touch quadrant because a user is more likely to grasp the device 1800 in this region and use the thumb of the grasping hand to provide a touch input.
  • the remaining quadrants are designated as the hover quadrants because a user is more likely to point to the device UI display in these areas with a pointing hand or other object.
  • the partitioning can be performed in software and/or firmware, where the quadrants can share sensor lines (not shown).
  • the partitioning can be done in hardware, where each quadrant can have separate sensor lines.
  • the device 1800 can operate in a mutual capacitance mode, where the sensor lines measure mutual capacitance.
  • the device 1800 can operate in a self capacitance mode and employ similar approaches as described above to detect but retain touch signals along with hover signals.
  • each partition includes at least one edge of the device for connecting the sensor lines to drive and sense circuitry.
  • FIG. 19 illustrates an exemplary method to concurrently sense a touching object and a hovering object using the device of FIG. 18.
  • partitions can be designated as a touch partition, a hover partition, and/or a dual partition based on the likelihood of touch, hover, or both, respectively, occurring at that partition (1910).
  • Mutual capacitance can be measured in each partition (1920).
  • Mutual capacitance sensing can more easily detect multiple objects, e.g., concurrent touching and hovering objects, than self capacitance sensing in most cases.
  • a measurement in a designated touch partition that is indicative of a detected object can be identified as a touch signal; whereas, a measurement in a designated hover partition that is indicative of a detected object can be identified as a hover signal (1930).
  • the signal can be ignored or discarded as indeterminable.
  • the magnitude of the signal can be compared to a predetermined threshold and deemed a touch signal if above the threshold and a hover signal if at or below the threshold.
  • FIG. 20 illustrates another exemplary method to concurrently sense a touching object and a hovering object in a touch and hover sensing device according to various embodiments.
  • the device can, but need not, be partitioned.
  • a capacitance can be measured (2005). If the measurement saturates the sensor lines, the measurement can be designated as a touch saturation signal (2010).
  • the device can be recalibrated based on the saturated measurement such that subsequent touches at the device do not saturate the sensor lines (2020).
  • amplitudes of voltages driving the sensors can be reduced proportionate to the touch saturation signal so as to provide an unsaturated capacitance measurement.
  • capacitance measurements can be reduced proportionate to the touch saturation signal so as to provide an unsaturated
  • FIG. 21 illustrates such an example.
  • finger 2112-b can hover above one area of touch and hover sensing device 2100 while finger 2114-b can hover above another area of the device.
  • the device 2100 can then detect both fingers and generate hover signals for further processing.
  • FIG. 22 illustrates an exemplary graph of hover signals generated from multiple hovering objects in a touch and hover sensing device according to various embodiments.
  • capacitance measurements along a sensor line can have peaks at sensor locations proximate to the hovering objects.
  • the measurements can be processed to determine hover signals for the hovering objects as illustrated in FIG. 23, for example.
  • the device can operate in a mutual capacitance mode.
  • capacitance can be measured (2310). Peaks in the capacitance measurements can be identified, indicative of multiple hovering objects (2320). Any suitable peak detection algorithm can be used to identify the peaks. Some stray or small identified peaks can be ignored or discarded to prevent false detections. Each identified peak can be considered a hover signal of a hovering object and retained for further processing (2330).
  • the touch and hover sensing device can be partitioned into quadrants (or other partitions) such that multi-hover can be realized in each quadrant, thereby increasing the number of hovering objects that can be detected.
  • baseline capacitance of the device can change over time.
  • Baseline capacitance refers to the capacitance of the device when there is no touch or hover at the device.
  • capacitance measurements indicative of a touch or a hover at the device can similarly change. This is known as signal drift.
  • Signal drift can adversely affect device action, particularly when the action is responsive to a particular capacitance measurement value or a particular capacitance range of values.
  • the baseline capacitance can be reset periodically to take into account any environmental, operating, mechanical, and other changes. The new baseline can then be applied to a touch or hover capacitance measurement to correct the measurement.
  • FIG. 24 illustrates an exemplary touch and hover sensing device that can compensate for signal drift according to various embodiments.
  • touch and hover sensing device 2400 can include touch and hover sensor panel 2426 and cover plate 2428.
  • the panel 2426 can include sensor lines for generating capacitance measurements indicative of a touching object and/or a hovering object.
  • the plate 2428 can be grounded and can cover the panel 2426 at a distance d from the panel.
  • the plate 2428 can be a device cover, for example, that a user can pull down or slide over the panel 2426 after the user finishes with the device 2400 temporarily.
  • the plate 2428 can be one side of a housing, for example, into which a user can place the device 2400 for storage or transport after the user finished with the device 2400 temporarily.
  • the device can compensate for signal drift. For example, when the plate 2428 covers the panel 2426, neither a touching nor hovering object is likely at the panel (since the panel cannot be used with the plate in place) such that any capacitance changes in the sensor lines at the panel can be solely or substantially due to signal drift. Capacitance measurements can be taken and the panel 2426 can be calibrated with the
  • FIG. 25 illustrates another exemplary touch and hover sensing device that can compensate for signal drift according to various embodiments.
  • touch and hover sensing device 2500 can be in docking station 2535.
  • the docking station 2535 can be grounded.
  • neither a touching nor hovering object is likely at the device such that any capacitance changes at the device 2500 can be solely or substantially due to signal drift.
  • Capacitance measurements can be taken and the device 2500 can be calibrated with the measurements as the new baseline.
  • a touching or hovering object is more likely at the device such that resetting the baseline capacitance can be suspended until the device is once again docked.
  • a touch and hover sensing device may not have either a cover or a docking station.
  • capacitance measurements can be taken and the device can be calibrated with the measurements as the new baseline. This can be done when the device is idle for an extended period, when the device is in use but between touch or hover detections, or in some otherwise non-touch or non-hover circumstance.
  • a new baseline capacitance can be set during a touch or hover. FIG. 26 illustrates such an example.
  • capacitance measurements can be taken during the time period to determine how the capacitance drifts over time. The average of that drift can be the new baseline. Similarly, the linger hovering without moving can be used to reset the baseline capacitance.
  • FIG. 27 illustrates an exemplary method to compensate for signal drift in a touch and hover sensing device according to various embodiments.
  • a determination can be made whether there is a touch or hover at the touch and hover sensing device (2710).
  • a user can input either an indication that there is no touch or hover or an indication to reset the baseline capacitance.
  • the touch and hover sensing device can determine that there is no touch or hover at the device, for example, by detecting a cover plate over the device (as in FIG. 24), the device in a docking station (as in FIG. 25), or some other device parameter indicative of a non-touch and non-hover condition.
  • the device's motion can be determined using any suitable motion detector or detection algorithm according to the needs of the device. If the device is moving, resetting the baseline capacitance can be suspended until conditions are more favorable. If the device is not moving, capacitance measurements can be taken to compensate for signal drift (2720). A determination can be made whether the capacitance measurements indicate some unacceptable condition, e.g., the measurements are either negative or drifting in a negative direction (2725). If so, resetting the baseline capacitance can be suspended until conditions are more favorable.
  • the measurements can be set as the new baseline capacitance for the device, thereby compensating for the signal drift (2730).
  • a determination can be made whether the touching or hovering object is substantially stationary (2750). If not, the device is likely in operation or the object is shaking such that resetting the baseline can be suspended until conditions are more favorable. If the touching or hovering object is substantially stationary, the object is likely touching or hovering to reset the baseline capacitance (as in FIG. 26). The capacitance can be measured at the device (2755). A determination can be made whether the capacitance measurements indicate some unacceptable condition, e.g., the measurements are either negative or drifting in a negative direction (2760).
  • resetting the baseline capacitance can be suspended until conditions are more favorable. Otherwise, if the capacitance measurements are acceptable, a determination can be made whether a predetermined time period associated with the baseline capacitance reset has expired (2765). If the time period has not expired, then additional capacitance measurements can be taken as long as the object remains stationary (2750-2765). If the time period has expired, the capacitance measurements taken over the predetermined time period can be averaged (2770). The average can be set as the new baseline capacitance for the device, thereby
  • the user can manually input a new baseline capacitance to compensate for the signal drift.
  • a capacitance can be measured indicative of either a touch or hover at the device (2780).
  • the new baseline capacitance compensated for signal drift, can be subtracted from the capacitance measurement to determine the capacitance change as a result of the touch or hover (2785).
  • the ability of a drive voltage to travel along a sensor line can be influenced by the drive voltage's frequency, where higher frequencies have more difficulty than lower frequencies.
  • the sensors at the start of the sensor lines can see stronger drive voltages than sensors at the end of the sensor lines, thereby generating stronger electric fields and subsequent touch and hover signals.
  • the sensors all along the sensor lines can be driven similarly, thereby generating acceptable electric fields and subsequent touch and hover signals everywhere. While higher frequency drive voltages are desirable, larger touch and hover sensing devices can have difficulty driving all the sensors along longer sensor lines. To compensate for the sensor lines' resistance, various sensor configurations can be used as described below.
  • FIG. 28 illustrates an exemplary touch and hover sensing device that can compensate for sensor resistance according to various embodiments.
  • adjacent sensor lines 2801 -a through 2801-d of touch and hover sensing device 2800 can be ganged together to lower sensor resistance.
  • Ganging the sensor lines 2801 -a and 2801-b can effectively form single sensor line 2810-a, where the lines' individual resistances are now in parallel, thereby halving the total resistance of the ganged lines.
  • the sensor lines 2801-c and 2801-d can be similarly ganged together to form single sensor line 2810-b.
  • Ganging can also lower the resolution of the device 2800 by combining two sensor lines into one. Accordingly, lowering the resistance to produce stronger signals can be balanced against lowering the resolution of those signals.
  • the amount of ganging can be determined so as to reduce the sensor lines' resistance while maintaining an appropriate sensing resolution.
  • the horizontal sensor lines are ganged together.
  • the vertical sensor lines can be similarly ganged together according to the needs of the device.
  • FIG. 29 illustrates another exemplary touch and hover sensing device that can compensate for sensor resistance according to various embodiments.
  • touch and hover sensing device 2900 can dynamically gang sensor lines according to the distance of hovering object 2914.
  • the sensitivity of the device 2900 to the object 2914 can be a function of the object's area and distance.
  • the object 2914 is farther away at distance D, its area can be smaller such that the capacitance measurement at the device 2900 can be smaller.
  • a higher sensor resolution can be preferred to properly sense the distant object. Accordingly, the sensor lines 2901 -a through 2901-d can remain separate to provide a higher resolution.
  • the object 2914 when the object 2914 is closer at distance d, its area can be larger such that the capacitance measurement at the device 2900 can be larger. A lower sensor resolution can still properly sense the object. Accordingly, the sensor lines 2901 -a and 2901-b can be ganged together as single sensor line 2910-a and the sensor lines 2901-c and 2901-d can be ganged together as sensor line 2910-b to realize lower sensor resistance. Ganging can be performed for horizontal sensor lines, vertical sensor line, or both.
  • FIG. 30 illustrates another exemplary touch and hover sensing device that can compensate for sensor resistance according to various embodiments.
  • drive voltage Vi can be applied to sensors along sensor lines 3001 of touch and hover sensing device 3000 from both directions at the same time such that the distance that the voltage has to travel along the lines is halved, thereby reducing the effects of the sensor resistance.
  • the drive voltages can be applied to sensors along sensor lines 3002 from both top and bottom directions at the same time.
  • FIG. 31 illustrates another exemplary touch and hover sensing device that can compensate for sensor resistance according to various embodiments.
  • touch and hover sensing device 3100 can be physically partitioned (symbolically illustrated by the partitioning lines) into quadrants 3100-a, 3100-b, 3100-c, and 3100-d, where each quadrant can have separate sensor lines 3101, 3102.
  • the partitioning can shorten the sensor lines by half, such that the resistance along each line is halved, thereby reducing the effects of sensor resistance.
  • each partition includes at least one edge of the device for connecting the sensor lines to drive and sense circuitry.
  • Touch or hover sensitivity can vary as a function of sensor location in a touch and hover sensing device. Sensor locations at the edges of the device can generally be less sensitive than sensor locations at the center of the device.
  • FIG. 32 depicts an example of such sensitivity variation as a function of sensor location in the device.
  • sensors at the center of the device can have greater sensitivity than sensors at the edges, where sensitivity decreases from the center to the edges. This means that an object hovering over the center of the device can be sensed farther away than an object hovering over the edges of the device, with the sensing distance decreasing from a maximum at the center to a minimum at the edges. This can produce inconsistent hover signals and, in some cases, missed hover signals at the device edges. Therefore, compensation for such sensitivity variation is desirable as depicted in FIG. 33, where the sensors at various locations have substantially the same sensitivity.
  • FIG. 34 illustrates an exemplary method to compensate for sensitivity variation in a touch and hover sensing device according to various embodiments.
  • capacitance can be measured at the device indicative of a hover at the device (3410).
  • the sensor location of the measurement can be determined (3420).
  • a gain factor can be applied to the measurement to increase the measurement as if it is at the center of the device in order to compensate for any variation (3430).
  • the gain factor can be multiplied with the measurement.
  • the gain factor can be calculated as a ratio representing the amount that the sensitivity is reduced at the hover detected location from the sensitivity at the center of the device.
  • sensors formed from sensor lines of a touch and hover sensing device can sense both a touching object and a hovering object.
  • the sensors can be configured based on mutual capacitance.
  • to sense a hovering object the sensors can be configured based on self capacitance. Switching a sensor between a touch mode and a hover mode can be accomplished through software, firmware, or hardware.
  • FIG. 35 illustrates an exemplary touch and hover sensing device that can switch between touch and hover modes according to various embodiments. In the example of FIG.
  • touch and hover sensing device 3500 can have sensor 3512 formed from sensor lines and coupled to touch and hover control system 3507, which can control the sensor switching between touch and hover modes.
  • the control system 3507 can include switch 3539, touch sensing circuit 3516, hover sensing circuit 3518, and controller 3520.
  • the switch 3539 can couple the sensor 3512 to either sensing circuit 3516, 3518.
  • touch mode the switch 3539 can couple the sensor 3512 to the touch sensing circuit 3516 to process a touch signal.
  • hover mode the switch 3539 can couple the sensor 3512 to the hover sensing circuit 3518 to process a hover signal.
  • the controller 3520 can control the switch 3539 according to any suitable control scheme.
  • the controller 3520 can switch between the two modes in response to a timer, where the switching occurs when the timer expires. At that point, the timer can be reset to count down to the next switching. In some embodiments, the controller 3520 can switch between the two modes in response to an input, such as a manual input from a user or a logical input from the device when a particular condition occurs.
  • the switch 3539 can have a substantial capacitance that can interfere with a touch signal or a hover signal from the sensor 3512.
  • the interference can be more adverse in the hover signal where the hover sensing circuit can measure absolute capacitance.
  • the interference can be less adverse, and in some cases advantageous, in the touch signal where the touch sensing circuit can measure differential capacitance (or changes in capacitance). For example, in some
  • the switch capacitance can be about 20 pF, which can be the dynamic range of the signal.
  • the switch capacitance can be offset with device components as illustrated in FIGs. 36 and 37 below.
  • FIG. 36 illustrates another exemplary touch and hover sensing device that can switch between touch and hover modes, the device having a gain amplifier for offsetting a capacitance that can be introduced into the device by a switch used to change between the two modes.
  • gain amplifier 3644 of hover sensing circuit 3618 can receive on one pin a hover sensing signal, indicative of a hover at sensor 3612 and of a capacitance at switch 3639, and can receive on the other pin a reference signal that the amplifier can subtract from the hover sensing signal.
  • the resulting output from the gain amplifier 3644 can be an unsaturated, corrected hover signal of the hover measured at the sensor 3612.
  • FIG. 37 illustrates another exemplary touch and hover sensing device that can switch between touch and hover modes having a capacitor for offsetting a capacitance that can be introduced into the device by a switch used to change between the two modes.
  • capacitor 3756 can be located between sensor 3712 and switch 3739.
  • the capacitor's capacitance can be in series with the switch capacitance, thereby effectively reducing the total capacitance experienced by hover sensing circuit 3718 by half.
  • the resulting signal to the hover sensing circuit 3718 can be unsaturated with a reduced sensitivity.
  • FIG. 38 illustrates an exemplary touch and hover sensing device that can switch between touch and hover modes according to various embodiments.
  • touch and hover sensing device 3800 can have sensor 3812 formed by sensor lines and coupled to touch and hover control system 3807, which can control the sensor switching between touch and hover modes.
  • the control system 3807 can include touch sensing circuit 3816, hover sensing circuit 3818, and controller 3820.
  • the hover sensing circuit 3818 and the touch sensing circuit 3816 can be connected together on a line coupled to the sensor 3812.
  • the controller 3820 can disable and enable the sensing circuits 3816, 3818 according to the mode.
  • the controller 3820 can send an enable signal to the touch sensing circuit 3816 and a disable signal to the hover sensing circuit 3818, such that the touch sensing circuit can process the sensor signal and the hover sensing circuit can float.
  • the controller 3820 can send a disable signal to the touch sensing circuit 3816 and an enable signal to the hover sensing circuit 3818, such that the hover sensing circuit can process the sensor signal and the touch sensing circuit can float.
  • the controller 3820 can generate and send the disable and enable signals according to any suitable control scheme. In some embodiments, the controller 3820 can generate and send the disable and enable signals upon expiration of a timer. The controller 3820 can reset the timer upon sending the signals.
  • the controller 3820 can generate and send the disable and enable signals in response to a particular condition at the device, e.g., according to the proximity of an object to the sensor 3812.
  • a particular condition at the device e.g., according to the proximity of an object to the sensor 3812.
  • characteristics of the touch sensing circuit and the hover sensing circuit can be adjusted so as to provide a high impedance state through a resistor at the touch sensing circuit to force the voltage path from the sensor to stay at the hover sensing circuit and to impede the parasitic capacitance at the touch sensing circuit from interfering.
  • Other solutions are also available for reducing parasitic capacitance.
  • FIG. 39 illustrates an exemplary method to switch between touch and hover modes of a touch and hover sensing device based on proximity of an object to the device according to various embodiments.
  • This method can be implemented in software, firmware, or hardware according to the needs of the device either to cause a switch to couple a sensor to an appropriate sensing circuit based on the mode, as in FIGs. 35 through 37 or to enable or disable sensing circuits based on the mode, as in FIG. 38.
  • a controller of a touch sensing device can switch to hover mode so that a hover sensing circuit of the device can measure a hover capacitance at sensors of the device (3910).
  • the controller can send a control signal to actuate a switch to couple with the hover sensing circuit.
  • the controller can send an enable signal to the hover sensing circuit and a disable signal to the touch sensing circuit.
  • the device can continue in hover mode, repeating a hover capacitance measurement (3910) and determining whether the object is still far away (3920) until the hover measurement exceeds the hover threshold, indicating that the object is touching or almost touching the device.
  • the controller can switch to touch mode so that a touch sensing circuit of the device can measure a touch capacitance at the sensors (3930).
  • the controller can send a control signal to actuate a switch to couple with the touch sensing circuit.
  • the controller can send an enable signal to the touch sensing circuit and a disable signal to the hover sensing circuit.
  • the device can continue in touch mode, repeating a touch capacitance measurement (3930) and determining whether the object is still touching the device (3940) until the touch measurement falls below the touch threshold, indicating there is no longer a touch on the device.
  • the measurement can be considered ambiguous since it is between the threshold hover measurement and the threshold touch measurement.
  • the device can switch between the two modes until such time that the measurement satisfies either of the thresholds. Accordingly, the controller can switch back to hover mode and the method can repeat (3910) through (3940).
  • FIG. 40 illustrates another exemplary method to switch between touch and hover modes of a touch and hover sensing device based on a timer according to various embodiments.
  • This method can be implemented in software, firmware, or hardware according to the needs of the device either to cause a switch to couple a sensor to an appropriate sensing circuit based on the mode, as in FIGs. 35 through 37 or to enable or disable sensing circuits based on the mode, as in FIG. 38.
  • a controller of a touch and hover sensing device can determine whether a timer has expired (4010). If the timer has not expired, the device can continue in the current mode (4020). If in a touch mode, sensors of the device can be coupled to a touch sensing circuit. If in a hover mode, the sensors can be coupled to a hover sensing circuit.
  • the controller can reset the timer (4030).
  • the controller can switch to another mode (4040). If the device was in the touch mode, the device can switch to the hover mode.
  • the controller can send a control signal to actuate a switch to decouple from a touch sensing circuit and to couple to a hover sensing circuit.
  • the controller can send an enable signal to the hover sensing circuit and a disable signal to the touch sensing circuit. If, however, the device was in the hover mode, the device can switch to the touch mode.
  • the controller can send a control signal to actuate a switch to decouple from the hover sensing circuit and to couple to the touch sensing circuit. In other embodiments, to perform the switching, the controller can send an enable signal to the touch sensing circuit and a disable signal to the hover sensing circuit.
  • the controller can repeat the method
  • some or all of the sensors can be switched between the two modes. For example, in some embodiments, a portion of the sensors can be switched to hover mode to couple to the hover sensing circuit and a portion of the sensors can be switched to touch mode to couple to the touch sensing circuit. This can implement panel partitioning as described previously. In other embodiments, all of the sensor can be switched to the hover mode to couple to the hover sensing circuit or to the touch mode to couple to the touch sensing circuit.
  • a touch and hover sensing device can integrate a display device with the touch and hover sensing panel, where the display can provide a graphical user interface with various graphics selectable via a touch or hover signal from the panel to cause the device to perform actions associated with the selected graphics. Because of its proximity to the panel, the display can interfere with the touch or hover signals generated by the panel to introduce noise, decrease touch or hover sensitivity, or otherwise adversely affect the signals. This can then cause unintended device action.
  • FIG. 41 illustrates an exemplary touch and hover sensing device that can reduce interference between the device display and the device touch and hover sensing panel according to various embodiments.
  • grounding shield 4138 can be disposed between touch and hover sensing panel 4126 and display 4128. The grounding shield 4138 can help electrically isolate the panel 4126 from the display 4128 to reduce undesirable effects from the display to the panel.
  • FIG. 42 illustrates another exemplary touch and hover sensing device that can reduce interference between the device display and the device touch and hover sensing panel according to various embodiments.
  • touch and hover sensing panel 4226 and display 4228 can be spaced apart by optimal distance d.
  • the optimal distance can be the distance at which effects from the display to the panel are substantially reduced or eliminated such that the touch and hover signals are minimally affected.
  • the optimal distance d 1mm.
  • the optimal distance d can substantially reduce or eliminate the need for a grounding shield.
  • FIG. 43 illustrates an exemplary computing system 4300 that can have touch and hover sensing according to various embodiments described herein.
  • computing system 4300 can include touch and hover control system 4306.
  • the touch and hover control system 4306 can be a single application specific integrated circuit (ASIC) that can include one or more processor subsystems 4302, which can include one or more main processors, such as ARM968 processors or other processors with similar functionality and capabilities.
  • ASIC application specific integrated circuit
  • processor subsystems 4302 can include one or more main processors, such as ARM968 processors or other processors with similar functionality and capabilities.
  • the processor functionality can be implemented instead by dedicated logic, such as a state machine.
  • the processor subsystems 4302 can also include peripherals (not shown) such as random access memory (RAM) or other types of memory or storage, watchdog timers and the like.
  • RAM random access memory
  • the touch and hover control system 4306 can also include receive section 4307 for receiving signals, such as touch and hover signals 4303 of one or more sense channels (not shown), other signals from other sensors such as sensor 4311 , etc.
  • the receive section 4307 can include a touch sensing circuit, a hover sensing circuit, and a switching mechanism to switch between the sensing circuits according to the received touch and hover signals 4303.
  • the touch and hover control system 4306 can also include demodulation section 4309 such as a multistage vector demodulation engine, panel scan logic 4310, and transmit section 4314 for transmitting stimulation signals 4316 to touch and hover sensor panel 4324 to drive the panel.
  • the panel scan logic 4310 can access RAM 4312, autonomously read data from the sense channels, and provide control for the sense channels.
  • the panel scan logic 4310 can control the transmit section 4314 to generate the stimulation signals 4316 at various frequencies and phases that can be selectively applied to horizontal lines and/or vertical lines of the sensor panel 4324.
  • the touch and hover control system 4306 can also include charge pump 4315, which can be used to generate the supply voltage for the transmit section 4314.
  • the stimulation signals 4316 can have amplitudes higher than the maximum voltage by cascading two charge store devices, e.g., capacitors, together to form the charge pump 4315. Therefore, the stimulus voltage can be higher (e.g., 43V) than the voltage level a single capacitor can handle (e.g., 3.6 V).
  • FIG. 43 shows the charge pump 4315 separate from the transmit section 4314, the charge pump can be part of the transmit section.
  • Touch and hover sensor panel 4324 can include a capacitive sensing medium having sensors for detecting a touch event or a hover event at the panel.
  • the sensors can be formed from a transparent conductive medium such as indium tin oxide (ITO) or antimony tin oxide (ATO), although other transparent and non- transparent materials such as copper can also be used.
  • ITO indium tin oxide
  • ATO antimony tin oxide
  • Each sensor can represent a capacitive sensing node and can be viewed as picture element (pixel) 4326, which can be particularly useful when the sensor panel 4324 is viewed as capturing an "image" of touch or hover.
  • the touch and hover control system 4306 has determined whether a touch event or a hover event has been detected at each sensor in the sensor panel, the pattern of sensors in the panel at which a touch event or a hover event occurred can be viewed as an "image" of touch or hover (e.g. a pattern of an object touching or hovering over the panel).)
  • Computing system 4300 can also include host processor 4328 for receiving outputs from the processor subsystems 4302 and performing actions based on the outputs that can include, but are not limited to, moving an object such as a cursor or pointer, scrolling or panning, adjusting control settings, opening a file or document, viewing a menu, making a selection, executing instructions, operating a peripheral device coupled to the host device, answering a telephone call, placing a telephone call, terminating a telephone call, changing the volume or audio settings, storing information related to telephone communications such as addresses, frequently dialed numbers, received calls, missed calls, logging onto a computer or a computer network, permitting authorized individuals access to restricted areas of the computer or computer network, loading a user profile associated with a user's preferred arrangement of the computer desktop, permitting access to web content, launching a particular program, encrypting or decoding a message, and/or the like.
  • host processor 4328 for receiving outputs from the processor subsystems 4302 and performing actions based on the outputs that can include, but
  • the host processor 4328 can also perform additional functions that may not be related to panel processing, and can be coupled to program storage 4332 and display device 4330 such as an LCD display for providing a UI to a user of the device.
  • the host processor 4328 can be a separate component from the touch and hover control system 4306, as shown.
  • the host processor 4328 can be included as part of the touch and hover control system 4306.
  • the functions of the host processor 4328 can be performed by the processor subsystem 4302 and/or distributed among other components of the touch and hover control system 4306.
  • the display device 4330 together with the touch and hover sensor panel 4324, when located partially or entirely under the sensor panel or when integrated with the sensor panel, can form a touch sensitive device such as a touch screen.
  • firmware stored in memory (e.g., one of the peripherals) and executed by the processor subsystem 4302, or stored in the program storage 4332 and executed by the host processor 4328.
  • the firmware can also be stored and/or transported within any computer readable storage medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions.
  • a "computer readable storage medium” can be any medium that can contain or store the program for use by or in connection with the instruction execution system, apparatus, or device.
  • the computer readable storage medium can include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus or device, a portable computer diskette (magnetic), a random access memory (RAM) (magnetic), a readonly memory (ROM) (magnetic), an erasable programmable read-only memory (EPROM) (magnetic), a portable optical disc such a CD, CD-R, CD-RW, DVD, DVD-R, or DVD-RW, or flash memory such as compact flash cards, secured digital cards, USB memory devices, memory sticks, and the like.
  • the firmware can also be propagated within any transport medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions.
  • a "transport medium” can be any medium that can communicate, propagate or transport the program for use by or in connection with the instruction execution system, apparatus, or device.
  • the transport medium can include, but is not limited to, an electronic, magnetic, optical, electromagnetic or infrared wired or wireless propagation medium.
  • FIG. 44 illustrates an exemplary mobile telephone 4400 that can include a display 4436 and a touch and hover sensor panel 4424 according to various embodiments.
  • FIG. 45 illustrates an exemplary digital media player 4500 that can include a display 4536 and a touch and hover sensor panel 4524 according to various embodiments.
  • FIG. 46 illustrates an exemplary personal computer 4600 that can include a touch and hover sensitive display 4636 and a touch and hover sensor panel (trackpad) 4624 according to various embodiments.
  • FIG. 46 illustrates an exemplary personal computer 4600 that can include a touch and hover sensitive display 4636 and a touch and hover sensor panel (trackpad) 4624 according to various embodiments.
  • 44 through 46 can advantageously provide improved touch and hover sensing according to various embodiments.
  • a capacitance measurement can be a measure of a capacitance at a particular time, i.e., an absolute capacitance, or a measure of a capacitance difference over a particular time period, i.e., a change in capacitance.
  • touch events or hover events can be detected by a measurement of absolute capacitance at sensing lines of a touch and hover sensing device.
  • touch events or hover events can be detected by a measurement of a change in capacitance at sensing lines of a touch and hover sensing device.
  • touch events or hover events can be detected by a combination of measurements of absolute capacitance and a change in capacitance at sensing lines of a touch and hover sensing device.
  • the particular measurement can be determined according to the particular function, e.g., signal compensation, signal detection, etc., being performed by the device.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Position Input By Displaying (AREA)
  • User Interface Of Digital Computer (AREA)
  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)
  • Indication And Recording Devices For Special Purposes And Tariff Metering Devices (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

Cette invention se rapporte à une compensation de détecteurs dans un dispositif de détection de contact et de survol. La compensation peut concerner une résistance de détecteur et/ou une variation de sensibilité de détecteur qui peuvent compromettre des mesures de contact et de survol dans les détecteurs. Afin de compenser une résistance de détecteur, le dispositif peut grouper des détecteurs adjacents de façon à réduire la résistance globale des détecteurs. En outre ou en variante, le dispositif peut commander les détecteurs avec des tensions en provenance de multiples directions de façon à réduire les effets de la résistance des détecteurs. Afin de compenser une variation de sensibilité de détecteur (en général à l'issue des mesures de survol), le dispositif peut appliquer un facteur de gain aux mesures, le facteur de gain étant fonction des emplacements des détecteurs, de façon à réduire la variation de sensibilité aux différents emplacements de détecteurs sur le dispositif.
PCT/US2011/046818 2010-08-27 2011-08-05 Compensation de détecteur de contact et de survol WO2012027087A2 (fr)

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US37782910P 2010-08-27 2010-08-27
US61/377,829 2010-08-27
US12/895,600 2010-09-30
US12/895,600 US8982060B2 (en) 2010-08-27 2010-09-30 Touch and hover sensor compensation

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PCT/US2011/046825 WO2012027088A2 (fr) 2010-08-27 2011-08-05 Détection de signaux simultanés pour une détection de contact et de survol
PCT/US2011/046814 WO2012027086A2 (fr) 2010-08-27 2011-08-05 Commutation de contact et de survol

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US20120050181A1 (en) 2012-03-01
WO2012027088A3 (fr) 2012-10-18
US20120050210A1 (en) 2012-03-01
US20160259474A1 (en) 2016-09-08
US20120050209A1 (en) 2012-03-01
KR20130075771A (ko) 2013-07-05
US20120050180A1 (en) 2012-03-01
US9268431B2 (en) 2016-02-23
WO2012027086A3 (fr) 2012-10-04
CN103168284B (zh) 2016-08-31
US20120050211A1 (en) 2012-03-01
WO2012027088A2 (fr) 2012-03-01
CN103154866A (zh) 2013-06-12
US20150338964A1 (en) 2015-11-26
CN103168284A (zh) 2013-06-19
US10289235B2 (en) 2019-05-14
EP2609492A2 (fr) 2013-07-03
CN106354331A (zh) 2017-01-25
US9098138B2 (en) 2015-08-04
KR20130075770A (ko) 2013-07-05
CN103154866B (zh) 2016-11-09
US20150169114A1 (en) 2015-06-18
KR101412879B1 (ko) 2014-06-26
US9836158B2 (en) 2017-12-05
CN106354331B (zh) 2019-07-12
WO2012027086A2 (fr) 2012-03-01
US8614693B2 (en) 2013-12-24
WO2012027087A3 (fr) 2012-10-26
US8982060B2 (en) 2015-03-17
US9851829B2 (en) 2017-12-26
EP2609489A2 (fr) 2013-07-03
EP2609489B1 (fr) 2018-09-19
US10198108B2 (en) 2019-02-05
KR101528687B1 (ko) 2015-06-12

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